Spark-gap mechanism



lJune 3, 1930. '.1. G. H. LIEBEI. ET AL I SPARK GAP MEGHANISM Filed July15. 1928 -2 sh'eats-:amava 1 illmllllllll!` iii . Hill I June 3, 1930.J. G. H. LIEBEL ET Al. 1,761,082..

SPARK GAPv MECHANISM Filed July 15, 1928 2 Sheets-Sheet -2 29 177 .5 :7I. 3mm/co W/MWM Strunz/n;

l5 f bermovable relativelyl'tothe-support'for'the l Patented June 3,19730 g 1,761,0s2f

JQHNL G.Y H; LIEBELAND -EDWIN s. FLAnsHmM-gorfCNGINNATI;01110;AssIGNeRsTof 'JJ-HE LIEBaL-FLABSHEIM complaisance eINcrNNMLoHioiA-KcoaroaA'rIoNeoa omo SPARK-GAPMECHANISMQ: y g p IApplicationiiieauiy:` 1,3,

Thisinventionfrelates to spa-rkgap mecha# nisms :of the v typeparticularly adapted for use in high frequency electro-therapeuticapparatus. Y Y v Infspark gap mechanisms `of this type it is desirableto:-have-a plurality'- of'individual v gaps-connecte'd-fin series, eachgap Yset rela- Y tively closely ratherthan the singlel gaphavingitselectrodes set a r-large I distance Y apart( y* Itfisfurther'desirable to have theindi vidual gaps ofthe seriessetrelat'ivelyy uniformlyg andi ift; has 'therefore4 been `found eX-pedient'toimount agpluralityfo spark elec Y tro'desupon-astationarymember fand' a pluralityiole` opposing electrodesupona-v memirst seto'ffelectrodes: In'thisway the series oigaps isunitarilyadjustable ;l access tothe 'terminationl thatV unexpected'eilieiency-- is at'-k gaps is easilyfhadandcleaning can :bef read-- ilyaccomplished.v e Y f The object of the invention is to providesimpleandic-onvenientspark gap mechanism-' adapted in-theproperenvironmenttoproduce a smooth and steady high "frequency, currenth'This invention is predicateduponthe de,-

taine'dby shieldingA the gaps from one' another byl members opaque tofultravioletf radiation- Ultra-violet radiatien- 'has an' ionizingl eectYupon l the atmosphere which@ quickly with thejresultthatfthelproperandf due poWer is not'deliveredlby the instrument- WGGIl-Saidf gapsto'inhibitjultraevioletradiay tion-from one to another. Y f

preferred embodimento this invention is' illustratedilin theaccompanying? drawings which 'discloseithe" sparl' electrodesandasseciated radiator plates rmounted fer:V facileadfjustmentfandcleaning'yetprotectedfrom vo'rre f rangementof the' shield.

192:3'.l seriai'Ne. 292,509:y n

anothers influence by appropriately disposedl' Y shields. Y g Y j tmechanis Figure 4' is X a sectional'I vieWJalen on' line Figure l,showing` the fmounting-offfa: 60' set ofelectrodes" 1 y Figure 5 i is alsectional vieW-*ta'lentor -lineyj- V 5 6,V Figure 4t, urtherdetailingthe*muntl-fI ing of the electrodestfl:

`Figure 6 is avievv illustratihg'- the" shield c5 orcuttingdovvnthera'diationof the ulti1 Y vio'letrays fromf-one Ito another of thegaps:

Figure 7- is asectional'vievv; takenonrline Y 7 7, Figure', furtherdetailingthe- 'a'r' Thev spark gap comprises; a rbasey 1 Whichj has twoside standardsfQ yand v3IV secured;- tb 'iti' by L members" 4@attachedVVE tof 'the' base? mehr-"9 berl 'by means ofs'crews'- andtotheside standards Y bly 'meansof! 'screws' '6 andfnutsj 75"vTheseside-Standards aret placed'1opposite te? i each"` other sof thattheggapwbars may4 be' mountedb'etweenthemk- Y I stationary bar-'85inadeof glass erf-some*- oth-er insulating materialh ismountedbetween-im these side standardsr'and i3ffbyme"an*s'Q-'tvyo 1brackets v9,*f'joneof' which extends inwardly from each sidestandardfa'nd clampingrir are secured t0 'said' brackets byn'uts' 11Ldis` 85's posed; 'on screws 12 vwhich `pass through' the.; endsf ofthe'clamping rings and thevr brackets."- Y Y lThe movable gap bar? 13`is placedbelovvthestationary: gap bar-as` disclosed; and fisffpro-H Yvided Withringsll atp'itl'siend's which-V are se- 9ecured'tobrackets-*1,5by means"ofjnu-ts16-dis=y Y posed on xscrews 17 i'which1 pass through the: ends of the' :rings and; thebracket; 1 "'f'Betweene brackets; 9 and l5# extendffco'iled: springs 18 secured attheir ends through eyelets :disp 'o'sed '5 in theends' of s'crewsl2'a`n'd pins- 19"Whicli.. extend: throughv thefbrackets T15. f e f fThe brackets l5 aresecured to slide barsQOf toWardEtheirmi'ddles'-,the-lovver'ends'foi these slidebars-being slotted; Vsaid;slotsjShavingen- "reo , ards.

oted a nut 24: into which is screwed one end of an adjustment screw 25.rllhis adjustment screw 25 is provided with a knurled end 26 and ashoulder 27 bearing downwardly.

against a horizontal flange 28a as a part of a standard 28 attachedv tothe base. Consequently, rotation of this adjustment screw swings theyoke, moves the slide bars and variesthe'space between the stationaryand movable gap bars. The raising of this adjustment screw 25 upwardlyaxially tends to separate the gap bars rapidly against the tension ofcoiled springs 18 and facilitates the cleaning of the mechanism.

Toward one another from both the stationary and movable gap vbars extenda plurality of radiator plates 29, adapted to support the sparkelectrodes 30 themselves. As disclosed, the radiator plates are groupedin sets of four plates disposed parallel to each other and spacedslightly. The plates are secured together in this spaced relationshipbyposts 31 and collars 32 placed on said posts between plates. On theouter ends ofthe posts are disposed the spark electrodes. Each set ofradiator plates isheld to its supporting gap bar by means of a ring 33disposed about the bar and screwed, welded or otherwise secured to theback plate of the set. j

As disclosed, the stationary gap bar is provided with ve sets ofradiator plates, said sets slightly spaced from each other horizontally,each set provided with two spark electrodes, one at each side of theforward radiator plate, all of said spark electrodes substantially inalignment with each other.

The movable Agap bar, as disclosed, is provided with four sets ofradiator plates similar to those carried by the stationary gap bar.V

TheseV sets are disposed in staggered relationship to the sets carriedby the stationaryV gap bar so that the spark electrodes carried by anygiven set of radiator plates are disposed opposite to the sparkelectrodes of two different sets carried by the opposite gap bar.

The movable gap bar is also provided with two sets of small radiatorplates 34 disposed adjacent to the ends of the gap bar. These sets alsocarry spark electrodes placed opposite to the end spark electrodescarried by the sets of plates supported bythe stationary gapbar. Thisstructure provides a series of ten spark gaps disposed in substantiallythe same plane. Y n

vEach set of radiator plates (except the sets 34) carries a shield 35which extends At the end of this member 23 is pivvtoward the opposinggap bar. Each shield is disposed intermediate the two spark electrodescarried by the plate so as to shield each gap from the radiation of t-headjacent gaps. As disclosed, these shields are secured to the innermostradiator plates by means such as Welding, riveting, etc.

Figure 7 discloses shields comprising tubes 36 of glass or otherinsulating material impervious or `opaque to ultra-violet radiationplaced over the opposing spark electrodes and thus to inhibit radiationof ultraviolet light from one gap to another.

In use the radiator plates 34 are connected into the desired circuitwhich disposes all ten of said gaps in said circuit in series with oneanother. The spark gap of this invention is therefore simple instructure, easy to adjust or clean, and adapted to provide out-putcurrent of smooth, steady and high voltage by virtue of the memberswhich insulate the gaps from one another as to ultraviolet radiation. Y

Having described our invention, we claim:

l. A spark gap mechanism particularly adapted for use in high frequencyelectrotherapeutic instruments and theV like, said mechanism,comprising, a stationary member, a member movable in relation thereto, aplurality of spark electrodes supported by the stationary member, aVplurality of opposing spark electrodes supported by the movable memberconstituting adjustable spark gaps in combination with the sparkelectrodes on the stationary member, said gaps defined by substantiallythe same planes and shields disposed between said gaps to inhibit theradiation of ultra-violet light from one to another.

2. A spark gap mechanism particularly adapted foruse in high frequencyelectrotherapeutic instruments and the like, said mechanism, comprising,astationary member, a member movable in relation thereto,

- a plurality of radiator plates carried by each of said members, aplurality of spark electrodes attached to said radiator plates anddisposed in opposing relationship to each other to constitute a seriesof spark gaps, and shield members disposed between each 0f said gaps toinhibit radiation of ultraviolet light from one to another.

3. A spark gap mechanism vparticularly adapted for use in high frequencyelectrotherapeutic instruments and the like, said mechanism, comprising,a stationary vsupporting member and a member movable relatively thereto,a plurality of radiator plates grouped in a series of sets, each set,comprising, a plurality ofy parallel spaced plates, some of said setssupported by said stationable relatively thereto, the sets carried-bythe stationary member staggered in relat1on ,to the sets carried by themovable member, some by said member movv each set of plates, said sparkelectrodes so disposed that the two electrodes of any given set are inopposing relationship to member, a plurality of vspark electrodescarried by said radiator plates', two for electrodes of two diierentsets supported by the opposite member, and shields ydisposed between thegaps formed by said opposing electrodes to prevent ultra-violetradiation from one gap to another.

4. A spark gap mechanism particularly adapted for use in high frequencyelectrotherapeutio instruments and the like, oomprising, a plurality ofspa-rk electrodes disposed in opposing pairs to constitute a series ofgaps defined by substantially the same planes, a series of radiatorplates disposed about said spark electrodes, and members opaque toultra-violet light supported by said radiator plates and extendingtherefrom to positions between the gaps `to inhibit the radiation fromone gap to another.

In witness whereof, we hereunto subscribev ournames.

JOHN Gr. H. yLIEBEL. EDWIN SQFLARSHEIM.

